Montae Nicholson's time with the Redskins is over ... he's been cut by Ron Rivera -- this just 4 months after he was wrapped up in an investigation over a woman’s death.
We broke the story, back on Nov. 14, Nicholson and a friend found 21-year-old Julia Crabbe "foaming at the mouth" in the safety's Ashburn, Virginia home after a night out.
According to police documents, 24-year-old Nicholson and the friend took Crabbe to a nearby hospital ... where she was later pronounced dead.